As the outer layers blast off into space, the core collapses under its own vast gravitational pull, swallowing itself up in an infinitely deep gravitational well.
When a star runs out of hydrogen fuel its core collapses inward under gravity and, hitting rock bottom, sends out a shockwave that blasts away the star's outerlayersas a supernova.
In addition to smaller feats such as repelling enemies and shattering projectiles, Thanos shot power blasts with the Power Stone and even used it to turn the outerlayer of a small moon into meteors.